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= 9x² - 15x - 15x + 25
= 9x² - 30x + 25
14) L = p × l
= (a + 3) (a - 2)
= a² - 2a + 3a - 6
= a² + a - 6
L = a² + a - 6
= 2² + 2 - 6
= 4 + 2 - 6
= 0
15) K = (6x + 3) + (7x - 8) + (2x - 5)
= 6x + 3 + 7x - 8 + 2x - 5
= 6x + 7x + 2x + 3 - 8 - 5
= 15x - 10
K = 15x - 10
= 15(3) - 10
= 45 - 10
= 35